On 11/5/26 20:51, Nathan Chen via Devel wrote:
> An 'ats' OnOffAuto property was introduced for QEMU vfio-pci devices in
> QEMU v11.0 [0]. This property controls whether the ATS capability is
> exposed in a device's PCIe config space. 'off' always masks the
> capability, 'on' fails device realize if the kernel reports it is
> unsupported for the device, and the default 'auto' value masks it if
> the kernel reports it is unsupported.
>
> This series exposes the property as an attribute of the hostdev
> <driver> element:
>
> <hostdev mode='subsystem' type='pci' managed='yes'>
> <driver name='vfio' ats='off'/>
> ...
> </hostdev>
>
> If the attribute is omitted, nothing is passed to QEMU and its 'auto'
> default applies.
>
> The attribute is rejected in network and network port <driver>
> definitions, as ATS visibility is a per-VM decision and network <driver>
> settings other than name/model do not apply. Users can still set the
> attribute for individual VFs through <interface type='hostdev'>.
>
> [0] https://github.com/qemu/qemu/commit/bc034e8a959c07471d1214b3525bb68fccce1031
>
> Nathan Chen (2):
> qemu: capabilities: Introduce QEMU_CAPS_VFIO_PCI_ATS
> qemu: Support vfio-pci per-device ATS attribute
>
> docs/formatdomain.rst | 8 +++
> src/conf/device_conf.c | 8 +++
> src/conf/device_conf.h | 1 +
> src/conf/network_conf.c | 6 +++
> src/conf/schemas/basictypes.rng | 5 ++
> src/conf/virnetworkportdef.c | 6 +++
> src/qemu/qemu_capabilities.c | 2 +
> src/qemu/qemu_capabilities.h | 1 +
> src/qemu/qemu_command.c | 1 +
> src/qemu/qemu_validate.c | 7 +++
> .../caps_11.1.0_aarch64.xml | 1 +
> .../caps_11.1.0_s390x.xml | 1 +
> .../caps_11.1.0_x86_64.xml | 1 +
> .../caps_11.2.0_aarch64.xml | 1 +
> .../caps_11.2.0_s390x.xml | 1 +
> .../caps_11.2.0_x86_64.xml | 1 +
> .../hostdev-vfio-ats.x86_64-latest.args | 36 +++++++++++++
> .../hostdev-vfio-ats.x86_64-latest.xml | 52 +++++++++++++++++++
> tests/qemuxmlconfdata/hostdev-vfio-ats.xml | 41 +++++++++++++++
> tests/qemuxmlconftest.c | 1 +
> 20 files changed, 181 insertions(+)
> create mode 100644 tests/qemuxmlconfdata/hostdev-vfio-ats.x86_64-latest.args
> create mode 100644 tests/qemuxmlconfdata/hostdev-vfio-ats.x86_64-latest.xml
> create mode 100644 tests/qemuxmlconfdata/hostdev-vfio-ats.xml
>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
and merged.
Michal